CPT 123 Internet Skills Class Notes Internet Services Session B.

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CPT 123 Internet Skills Class Notes Internet Services Session B

Transcript of CPT 123 Internet Skills Class Notes Internet Services Session B.

Page 1: CPT 123 Internet Skills Class Notes Internet Services Session B.

CPT 123 Internet Skills

Class NotesInternet Services Session B

Page 2: CPT 123 Internet Skills Class Notes Internet Services Session B.

CPT 123 Internet Skills

GopherBrowsing service for use on the

InternetOne of the earliest servicesPopular for several reasonsFirst widespread browsing serviceMany sites ran gopher servers

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CPT 123 Internet Skills

Provided access to large quantity of information

Popular among novice and non-technical Internet users because the interface was intuitive and easy to use

User did not need to remember commands to use gopher

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Popularized menu-driven approach to information browsing

Displays a menu of choices for the userEach menu item is a short, self-

explanatory phraseEach item on a menu contains a hidden

reference to additional information

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CPT 123 Internet Skills

Additional information can correspond to data in a file or to another menu item

After menu is displayed, the browser software waits for the user to read the menu and select an item

If hidden reference points a data file, browsing software obtains a copy of the file and displays its contents

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CPT 123 Internet Skills

If hidden reference points to another menu, the browsing software obtains the new menu and displays it, and waits for the user to make another selection

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CPT 123 Internet Skills

If hidden reference points to another computer system, the browsing software jumps to the other computer system and displays a menu from that system

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CPT 123 Internet Skills

Wide Area Information Servers (WAIS)Similar to Gopher, service provides

one user interfaceWAIS program worries about how to

access information of multiple databases

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CPT 123 Internet Skills

User get a menu of documents ranked according to how relevant the server thinks it is to the user’s search

Like Gophers, WAIS client programs can be found on many public access Internet sites

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Internet Relay Chat (IRC)A program that lets you hold live

keyboard conversations with people around the world in real time

Each communication occurs on a separate “channel”

A user can create a channel and choose a topic

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CPT 123 Internet Skills

The user specifies whether the channel is open to anyone or restricted to the set of people specified by the channel creator

A user can request a list of IRC channels currently in progress and join one of the channels

User selects an alias that the IRC uses to identify the user to others

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CPT 123 Internet Skills

Participant receives each line of text that another participant enters along with participants alias

A participant knows that all other participants will receive a copy of the text on their screens

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MUD, MUCK, and MUSE GamesMultiple-User Dimensions or

Dungeons (MUD) are live, role-playing games in which the user enters, assumes a new identify, and enters an alternate reality through the keyboard

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CPT 123 Internet Skills

You explore this alternative reality through a series of simple commands

You run across other users who may engage you in a discussion, enlist your aid in a quest, or try to kill you for no apparent reason

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CPT 123 Internet Skills

MUCKs and MUSEs are games related to MUDs

You may be required to apply in advance for a character name and a password

Along with these Classical Board Games which are interactive can also be found on the Internet

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CPT 123 Internet Skills

NetfindNetfind is a service that uses finger

and e-mail to locate a personUser enters the name of an

individual and information about the organization for which the individual works

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CPT 123 Internet Skills

Netfind consults a list of organizations to obtain the address of a computer at the organization

Then it invokes the finger service at that computer to obtain information about that individual

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The finger program contacts a server on a remote machine to obtain information about a specific user or all user on that machine

Although designed to provide information about users, finger has been extended to locate a given userid at a given computer

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CPT 123 Internet Skills

TalkTalk provides interaction between a

pair of usersTalk establishes a connection

between computers and divides the display screens in half

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CPT 123 Internet Skills

What the user types on the keyboard appears in the upper half of the user’s screen and in the lower half of the remote screen

Talk sends each keystroke as soon as a user presses the key, so two people can read instantly what the other person types

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TracerouteUsers who are interested in the

structure of the Internet can run the traceroute program

Given the name of a remote computer, traceroute prints the list of Internet routers along the path from the local computer to the remote computer

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Although traceroute was intended for use when installing and maintaining Internet connections, it is interesting to see how many routers separate your computer from a given destination computer

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World Wide Web (WWW)This service is the hottest thing on

the Internet currently


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CPT 123 Internet Skills

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CPT 123 Internet Skills Class Notes World Wide Web Session.

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